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Appendix 1: Connector Wiring
Appendix 1.4. D9 (RS 232) Data and Interface Connectors
Viewed from wiring side
1
6
5
9
Female
1
5
9
6
Male
Pin INTERFACE
DCE
1
No Connection
2
TX Data
3
RX Data
4
No connection
5
Signal Ground
6
No Connection
7
CTS
8
RTS
9
No connection
Female DATA Male DTE
No connection
RX Data
TX Data
No connection
Signal Ground
No connection
RTS
CTS
No connection
Table 22: D9 Data and Interface Connector
Appendix 1.5. D15 X.21 Interface Connector
The pin-outs for D-15 X.21 module connections are displayed in the following
image. A straight-through cable is required from the male D15 connector on the
X.21 module to a female DB15 connector, which will attach to an ISDN
TA/X.21 DCE Device.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Signal
Shield
Transmit (A)
Control (A)
Receive (A)
Indication (A)
Signal Timing (A)
Unassigned
Ground
Transmit (B)
Control (B)
Receive (B)
Indication (B)
Signal Timing (B)
Unassigned
DTE
Out
Out
In
In
In
DCE
In
In
Out
Out
Out
Out
Out
In
In
In
In
In
Out
Out
Out
Table 23: X.21 Pin-outs for D-15 Connectors
With this pin configuration all signals are balanced. The DCE (Typically ISDN
TA) provides Signal Timing, ensuring X.21 data is synchronous.
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